Half to walteb j



UNITED STATES PATENT OFFICE.

VESTEL E. HAWKINS, OF \VALLINGFORD, CONNECTICUT, ASSIGNOR OF ONE- HALF TO lVALTER J. LEAVENWORTH, OF SAME PLACE.

ADJUSTABLE. PITMAN.

SPECIFICATION forming part of Letters Patent No. 257,004, dated April 25, 1882,

(No model.)

To all whom it may concern:

Be it known that I, WEsrrEL E. HAWKINS, of VVallingford, in the county of New Haven and State of Connecticut, have invented a new Improvement in Adjustable Pitmen; and'I do hereby declare the following, when taken in connection with accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same,

and which said drawings constitute part of this specification, and represent, in--- Figure 1, a longitudinal or vertical central section; Fig. 2, a transverse section on line 00 a.

This invention relates to a device for adj usting the length of a pitman, with special reference to power-presses and other machinery in which nice adjustment of the length of the pitman is required.

In the use of power-presses for stamping and 2: embossing purposes it is essential that the two parts of the die shall come into a certain or positive relation to each other, in order that the embossed surface may be sharply defined. In practice the method most generally used is to introduce pieces of thin metal or paper between either part of the die and its bed, whereby the relationofone parttothe otheris changed to the extent of such packing; but this is a difficult and tedious operation, because it neces- 0 sitates the removing or loosening the dies from or in their seats in order to introduce the packing. Pitmen have been made adjustable as to length, whereby the extreme point of the thing moved could be varied oradjusted butsuch con- 3 5 structions have been such as requirea special adaptation of machine to them, or so complicated in their construction as to make them impracticable.

The object of this invention is a simple, easy,

0 and positive adjustment made in the pitman itself; and it consists in constructing the pitman in two parts, the one part arranged to enter longitudinally into a corresponding cavity in the other part, with a set-screw between the two parts,arranged to move the one part to or from the other by the rotation of the screw, combined with athreaded nutor sleeve,which holds the two parts together when properly adjusted, as more fully hereinafter described.

In the illustration 1 show a pitman adapted for use in a power-press, which is sufficient to enable those skilled in the arts to which this invention pertains to apply the invention to pitmen for other purposes.

A represents the part of the pitman which 5 is attached to the crank or mechanism for imparting a reciprocating movement; B, the other part, which is attached to the slide or thingto be moved. The one part is constructed with arccess,C,inits end, and the otherconstructed with ashank,l), to fit into said recess and move freely therein. It is also constructed with a collar, a, at the lower end of the shank D. The partA is threaded upon the outside around the recess 0, and over the end a sleeve, E, is 6 fittedcorrespondingly threaded. This sleeve has an opening at its lower end, so as to pass freely on over the part B, to be screwed onto the other part, A, and is constructed with an internal shoulder, 1), corresponding to the 001- lar a, so as to come to a bearing against the said collar, as shown in Fig. 1.

F is a spindle, its upper end inserted into a corresponding cavity in the part A, its lower end, f, screw-threaded to fit a corresponding internal screw-thread in the shank D of the other part, B. The spindle is constructed with a collar, G,which stands in the recess 0 above the shank D. The spindle takes a solid bearing in the part A, either at its upper end, or may be on the collar C, as shown. Hence the thrusts which may come upon the reciprocating part, moved through the pitman,will come upon the spindlethrough the threaded portion in the part D and its hearing on the part A. If the spindle be turned in one direction, it will force the part B away from the part A to the extent of such turning,because the spindle has no longitudinal movement. If it be turned in the opposite direction, then the distance between the bearing and the part A and the part B may be shortened to the extent of such turnen the pitman; unscrew the sleeve F; then turn the spindle, as before described or other wise, to the supposedextent; then return the sleeve, which, bearing against the collar a, will force the part B into .tirm bearing contact with the part A; then, if upon trial it be found that the length is insufficient, repeat the operation. If, on the contrary, the reverse adjustment be required, loosen the nut to relieve the screwspindle; then turn that spindle in the opposite direction, and return the slceveE to bring the parts to a hearing, as before. By this construction the adjustment may be made with the greatest nicety and withoutdisturbing the dies or parts which may be attached thereto, and it may be applird totpresses and other devices already in use, as it requires no change, except in the pitman itself, that containing the entire adjusting mechanism. Another great advantage of this adjustment as relating to powerpresses is that the dies having been once arranged in their proper level position with relation to each other they are not changed bysubsequent adjustment, as they generally are in he inverted and be threaded into the part A while taking its bearing in the other part, and also that the sleeve may pass over the part A to bear a-gainst'a shoulder thereon, and screwthreaded onto the other part. I therefore do not limit my invention to the particular arrangement of the parts shown and hereinbefore described.

I claim 1. The combination, in an adjustable pitman, of the two parts AB, the one part arranged to move longitudinally in a recess in the other part, with a spindle taking a bearing on one part and screw-threadedinto the other part, with a locking-sleeve to bind the two parts together, substantially as described.

2. Thecombinatiomin an adjustable pitman, of the two parts A B, the one part arranged to move longitudinally in a recess in the other part, with a spindle taking a bearing on one part and screw-threaded into the other part, with a locking-sleeve to bind the two parts together, the said spindle provided with a collar,

G, with an opening, h, through the part in which it is arranged, and means, substantially such as described, for rotating the said spindle through said opening, substantially as described.

W. E. HAWKINS. Witnesses:

B. TRUMBULL JONES, JESSE P. Fos'rnn. 

